9993221 has 16 divisors (see below), whose sum is σ = 12111360. Its totient is φ = 8054640.

The previous prime is 9993209. The next prime is 9993223. The reversal of 9993221 is 1223999.

It is a cyclic number.

It is not a de Polignac number, because 9993221 - 2¹⁰ = 9992197 is a prime.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9993223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30026 + ... + 30356.

It is an arithmetic number, because the mean of its divisors is an integer number (756960).

Almost surely, 2^9993221 is an apocalyptic number.

It is an amenable number.

9993221 is a deficient number, since it is larger than the sum of its proper divisors (2118139).

9993221 is a wasteful number, since it uses less digits than its factorization.

9993221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584.

The product of its digits is 8748, while the sum is 35.

The square root of 9993221 is about 3161.2056244414. The cubic root of 9993221 is about 215.3947749558.

The spelling of 9993221 in words is "nine million, nine hundred ninety-three thousand, two hundred twenty-one".